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Reports <code>@oneOf</code> violations in GraphQL.
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    <li>Exactly one field must be supplied to OneOf input objects</li>
    <li>The field supplied must not be null</li>
    <li>If a variable is supplied, it must be of a non-null type</li>
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    See <a href="https://github.com/graphql/graphql-spec/pull/825">the OneOf Input Objects RFC</a> for more information.
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